Comparison of Lightweight and Small Portable Oxygen Concentrators

Overview of the Eight Smallest Portable Oxygen Concentrators

The greatest draw of portable oxygen concentrators is in their name: portable. These units are small and light enough to carry around, opening up the world for those who need to use oxygen on a continuous basis. Their rising popularity has brought a number of models to market, which means that you have much more choice in oxygen concentrators. We’ve created this side-by-side comparison of the eight most popular portable oxygen concentrators, all of which are available through Oxygen Concentrator Store.

Oxygen Flow Settings and Capabilities

The first feature that most oxygen concentrator users will look at is the unit’s oxygen delivery capabilities. Most portable oxygen concentrators only deliver pulse dose oxygen but offer a wide range of settings so that users can select very specific settings.

Three of the seven units offer five settings for pulse dose delivery, including CAIRE Freestyle Comfort, Respironics SimplyGo Mini, and Inogen One G4. Invacare Platinum and Lifechoice ActivOx 4L offer four settings, while AirSep FreeStyle 3 features three settings.

Only one unit, the AirSep Focus, offers a single setting; to make this unit truly convenient and lightweight, it only offers setting 2, the most commonly prescribed pulse dose delivery setting.

Comparison of Lightweight and Small Portable Oxygen Concentrators

Weight and Size

All seven portable oxygen concentrators weigh five pounds or less with a single, 8-cell battery. Here, the AirSep Focus stands out once again. This tiny unit weighs a surprising 1.75 pounds, and each battery adds just 0.53 pounds. As a result, the total weight for an AirSep Focus with one battery is just 2.28 pounds, less than half of the lightest unit in the rest of the lineup, the Lifechoice ActivOx 4L, which clocks in at 4.8 pounds. Even with two batteries the AirSep Focus weighs just 2.81 pounds, far less than its closest counterpart.

Battery Life

Battery life is of utmost importance in small and lightweight portable oxygen concentrators, as they’re meant to be taken out of the house and used on the go. A long battery life is, therefore, high on the list of must-haves for oxygen users.

The unit that lasts the longest at setting 2 with a single or internal battery is Lifechoice ActivOx 4L, which will last about 8.25 hours on average. The AirSep Focus, on the other hand, lasts the least amount of time at 1.5 hours.

FAA Approval

All units are approved by the Federal Aviation Administration, meaning that you may take them on a plane. Before heading to the airport, make sure that you understand how to fly with an oxygen concentrator.

Noise Levels

If sound is of a concern, any unit would be a good choice. All units register from 40 to 44 decibels, which is about as loud as a refrigerator humming or a quiet residential area.

Side-by-Side Lightweight Unit Comparison

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Respironics SimplyGo Mini
Respironics SimplyGo Mini Specifications
CAIRE Comfort
CAIRE Freestyle ComfortSpecifications
Inogen One G4
Inogen One G4 Specifications
Rhythm Healthcare P2
Rhythm Healthcare P2 Specifications
Airsep Focus
Airsep Focus Specifications
Inogen One G3
Inogen One G3 Specifications
Invacare Mobile
Invacare Mobile Specifications
Dimensions 8.3" Wide x 3.6" Deep x 9.4"High (10.2" High with extended battery) 7.3" Wide x 3.1" Deep x 10" High (11" with 16-cell battery) 5.91" Wide x 2.68" Deep x 7.2" High (includes single battery) 8.7" Wide x 3.3" Deep x 6.3" High 4.8" Wide x 2.5" Deep x 6.4" High 8.75" Wide x 3" Deep x 8.25" High 7.5" Wide x 3.88" Deep x 9.45" High
Unit Weight 5 pounds with 8-cell battery, 6 pounds with extended battery 5 pounds with 8-cell battery, 6 pounds with 16-cell battery 2.8 pounds; add 2 to 5 pounds with accessories 4.4 Pounds with battery installed 1.75 pounds (unit only); 0.53 pounds each battery 4.9 pounds with 8-cell battery 4.8 pounds with 1 battery
FAA Approved Yes Yes Yes Yes Yes Yes Yes
Learn about the 5 Pound SimplyGo Mini Learn More about the 5 Pound CAIRE FreeStyle Comfort Learn More about the 2.8 Pound Inogen One G4 Learn about the 4.4 Pound Rhythm P2 Learn More about the 2 Pound AirSep Focus Learn More about the 4.9 Pound Inogen One G3 Learn More about the 4.8 Pound Invacare Platinum

The Final Choice: Portable Oxygen Concentrators

The seven of the smallest, lightest weight portable oxygen concentrators have a lot in common. They are all a similar size and weight and offer very similar settings, ranging from pulse dose settings 1 through 5. Only one unit features distinct characteristics: the AirSep Focus. If you’re looking for a truly portable unit that you only need to use for short periods of time, it may be the unit for you.

Otherwise, your decision may boil down to the accessories and add-ons, such as the style of the carrying case or additional batteries that it may come with, a unique feature or even something so simple as the color.

Updated: March 8, 2023

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